Network address translation and port mapping

Abstract

A method of processing a client packet from a client in a NAT (Network Address Translation & Port Mapping) system including a NAT machine and a plurality of servers. The method includes preparing a response packet responsive to the client packet, performing, by one of the servers, a translation operation on the response packet to produce a translated response packet, and transmitting the translated response packet from the server to the client, thereby bypassing the NAT machine. All subsequent response packets in the current connection can be translated and transmitted from the server directly to the client.

Description

BACKGROUND OF THE INVENTION[0001] 1. Field of the Invention[0002] The present invention relates to load distribution systems and more particularly, to an improved NAT (Network Address Translation and Port Mapping) method and system for distributing data packets from clients in a website system.[0003] 2. Discussion of the Related Art[0004] Network Address Translation and Port Mapping (also known as "NAT") is the translation of an Internet Protocol address (IP address) and port used within a first network, to a different IP address and port used within a second network. In a conventional NAT system, a single NAT machine and a plurality of identical servers are provided as part of a website system of a website provider. Since the servers are identical, each server is capable of processing data packets from different client devices or PCs and thus, client load can be distributed among these servers. A data packet from a client device (hereinafter "client packets") can contain a request ...

AI Technical Summary

Benefits of technology

0012] By configuring the servers, instead of the NAT machine, to perform outbound translations on the response packets, the traffic bottleneck problem and the capacity limitation imposed by the conventional NAT machines are eliminated and the overall operation and performance of the system is improved.

Problems solved by technology

In the conventional NAT system, however, a problem of traffic "bottleneck" exists at the NAT machine because all incoming packets from the client devices and all outgoing packets from the servers pass through the NAT machine.

The traffic bottleneck problem limits severely the total capacity of the system.

Furthermore, since the size of the outgoing packets from the servers is typically much larger than the size of the incoming packets from the client devices, the traffic bottleneck problem causes significant delays in the transmission of response packets to the client devices and data can be lost due to lengthy response times. Due to these problems with the conventional NAT systems, customers are often dissatisfied with the service offered by the website system and the website providers can lose valuable customers, forfeiting profit and jeopardizing professional reputation.

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